General Description

The secondary air injection (AIR) system helps reduce Hydrocarbon (HC), Carbon Monoxide (CO), and Oxides Of Nitrogen (NOx) exhaust emissions. It also helps to warm up the 3-way catalytic converters quickly on engine start-up so conversion of exhaust gases can occur sooner.

The system includes the following:
^ AIR pump - The AIR pump is mounted to the lower left front of the engine Compartment and supplies the air to the AIR system. The electric air pump pressurizes air from the filtered air intake and pumps it through the AIR Shut Off Valve to the check valves near the exhaust manifolds. The AIR pump is controlled by the PCM. Battery voltage to the AIR pump is controlled by the AIR pump relay. The AIR Shut Off valve prevents air flow through the pump during OFF periods. When the PCM provides a ground for the secondary AIR pump relay, battery voltage is applied to the AIR pump.
^ AIR Solenoid Valve - The AIR Solenoid Valve is mounted in the right fender well, above the PCM. The AIR Solenoid Valve is PCM controlled. When the AIR System is enabled, the PCM provides a ground to the AIR Solenoid Valve. Enabling the AIR Solenoid Valve allows engine vacuum to applied to the AIR Shut Off Valve.
^ AIR Shut Off Valve - The AIR Shut Off Valve is a vacuum operated valve. When the AIR System is enabled, the PCM turns ON the AIR Pump, and the AIR Solenoid Valve. When the system is enabled, an engine vacuum is applied to the AIR Shut Off Valve, through the AIR Solenoid Valve. This vacuum opens the AIR Shut Off Valve and allows air from the AIR Pump to flow to the check valves.
^ Check valves - The check valves prevent back flow of exhaust gases into the AIR pump in the event of an exhaust backfire.
^ Necessary plumbing, including the following components:
- Hoses
- Pipes
- Clamps